Keystroke twins - 35

manly
manky

Keystroke twins - 34

slummy
plummy

Keystroke twins - 33

barmaid
carnage

Keystroke twins - 31/32 (for my Sri Lankan brethren)

contests
converts

election
ejection

Keystroke twins - 30

enter
Dover

Keystroke twins - 29

prose
spore

Keystroke twins - 28

thug
uhuh

Keystroke twins - 27 (cricketing edition)

runs
stop

Keystroke twins - 26

heroic
hernia

Keystroke twins - 25

mature
obtuse

Keystroke twins - 24*

sites
river

--
* one for the arch. & anth. brigade

Keystroke twins - 23 (a & b)

intern
govern

internment
government

Keystroke twins - 22

alter
blues

Keystroke twins - 21

Rgr
Sir

Keystroke twins - 20

roses
poses

Keystroke twins - 19

peers
peeps

Keystroke twins - 18

poppy
sorry

Keystroke twins - 17 / Squaddie banter VI

Army
crow*

--
* this one, I confess, may have slightly more resonance(s) for those who are actually in the Army... All readers, though, may delight in the peculiarly military quality of the word's etymology and/or definition, as provided by UrbanDictionary.com!

Keystroke twins - 16

Jaffna
Laden2

Keystroke twins - 15

wood
zone